Mixed Emotions Make You Smarter And Happier

That’s a grand claim!
Yes, a catchy headline, but it is based on recent scientific research.
And, what on earth do you mean with “mixed emotions”?
Well, we all know classic emotions such as being happy or sad but mixed emotions are like a “sad kind of happiness”, or the “bitter-sweet” end to a film, or the “threatening awe” of an approaching thunderstorm.